.page-header {
  position: absolute;
  width: 100%;
  height: 50px;
  border-bottom: 1px solid #BBBBBB;
  line-height: 50px;
  text-align: center;
  background-color: #eeeeee;
}

.page-body {
  height: 100vh;
  padding-top: 50px;
  box-sizing: border-box;
}

.page-nav {
  float: left;
  width: 320px;
  height: 100%;
  background-color: #BBBBBB; 
}

.page-content {
  height: 100%;
  padding-left: 320px;
}

.layui-body iframe {
  width: 100%;
  height: 100%;
}

